Transfer Roller Cleaning - Ricoh A250 Service Manual

IMAGE TRANSFER AND PAPER SEPARATION

2.5.3 TRANSFER ROLLER CLEANING

If the paper size is smaller than the image, or if a paper jam occurs during printing,
toner may be transferred to the roller surface. To prevent the toner from
transferring to the back side of the printouts, the transfer roller requires cleaning
before the next printing run.
During transfer roller cleaning, the high voltage supply unit supplies a negative
cleaning voltage to the transfer roller. Any negatively charged toner on the transfer
roller is then transferred back to the drum. Then a positive cleaning voltage is
applied to the transfer roller to push back to the drum any positively charged toner
on the transfer roller.
The machine goes through the cleaning mode in the following conditions:
• After a paper jam has been cleared.
• Just after the power is switched on.
• After 10 or more sheets of paper have been copied and the copy job has
finished.
SP 2-910 determines how often the transfer roller is cleaned. If this is set to 1, the
transfer roller is cleaned after every job. If it is set to 0, the roller is cleaned every
10 copies (the machine waits until the end of the job).
A250 2-46 SM